Mercedes W639 115 CDI OM646.982 150HP Engine Module ECU Set A6461500791 Manual

Mercedes W639 115 CDI OM646.982 150HP Engine Module ECU Set Manual is a control set designed for the diesel unit, engineered for Mercedes vehicles with a manual transmission. The set belongs to the Electronic control modules and controllers group, which ensures precise management of the diesel engine's operation and stable integration with the vehicle's other electronic systems.

Specifications and technical data

• SKU: A6461500791
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6461500791
• Substitutable numbers: A6461500791, A 646 150 07 91, 0281012355, 0 281 012 355, A6395450108, A 639 545 01 08, A2034621130, A 203 462 11 30
• Fuel type: Diesel
• Gearbox type: Manual
• Category: ECUs & Computer Modules

Purpose and function of the ECU set

The presented engine control set is dedicated to the 150HP OM646.982 unit in the Mercedes W639 115 CDI model with a manual transmission. Its task is to comprehensively control the operating parameters of the diesel engine, such as fuel dosage, boost pressure, and operational adjustments under various load conditions. This ensures that the powertrain maintains proper refinement, and the throttle response remains predictable and consistent.

Electronic control modules and controllers – characteristics

Components in the Electronic control modules and controllers category are responsible for communication between sensors, engine accessories, and the vehicle's electrical system. In the case of a diesel engine, precise control of fuel injection and cooperation with engine protection systems are crucial. Using a dedicated ECU set for a specific engine and transmission version reduces the risk of communication errors, facilitates diagnostics, and allows for the preservation of factory system logic.

Benefits of using an original diesel set with a manual transmission

Selecting the correct control module for a diesel engine with a manual transmission has a direct impact on the durability and stability of the powertrain. A set matched to the specific vehicle configuration:

• provides consistent control maps for the diesel engine,
• maintains proper cooperation with onboard systems,
• reduces the risk of incompatibility resulting from software differences,
• facilitates future computer diagnostics and updates.

Thanks to this solution, it is possible to restore the proper operation of the power unit after a controller failure or communication problems in the electrical system.

Used condition – a conscious choice for engine electronics

The offered ECU set is in used condition, which allows for economical vehicle repair while maintaining the manufacturer's original specifications. In the case of engine electronics, it is important that the components come from the same design family, which minimizes the need for installation modifications. A used control module can be a good solution for repairing vehicles that are used intensively, where a reasonable cost is important while maintaining proper functionality.

If you want to better understand when choosing a used engine controller is justified and how to safely select such a component, it is worth reading the guide The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.

Selecting other control modules for Mercedes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as engine controllers, power unit management modules, or electronic controllers working with the injection system, check the available parts in the Mercedes electronic control modules and controllers category.

Additionally, for a wider range of service work on vehicles of this brand, the article describing the advantages of using original dismantled parts may be helpful: Used parts for Mercedes – original parts from dismantling.